Pfizer had provided little data on safety of extra doses. And they complained that data provided by Israeli researchers about their booster campaign might not be suitable for predicting the US experience.
Scientists inside and outside the government have been divided in recent days over the need for boosters and who should get them, and the World Health Organisation has strongly objected to rich nations giving a third round of shots when poor countries don't have enough vaccine for their first.
The panel, made up of outside experts who advise the Food and Drug Administration, weighed a less than clear-cut case: While research suggests immunity levels in those who have been vaccinated wane over time and boosters can reverse that, the